Method of forming ringlike members



Aug. 19, 1930. w. .1. BOYLE, JR 1,773,565

METHOD OF FORMING RING LIKE MEMBERS Filed Sept. s, 1927 $778622 Z- 07 Willis J. 50376. J

Ares,

WILLIs J. BOYLE, m, or LOS ANGELES, CALIFORNIA, ssIGNoR To THE BOYLE MANU- IAGTURING COMPANY, INC., OF .LOS ANGELES, CALI ?ORNIA, A CORPORATION OF CALIFORNIA METHOD OF FORMING BINGLIKE MEMBERS Ap plication filed September s, 1927. Serial K01 213387.

This invention relates to improvements in method of forming ring-like members and more particularly rolling hoops: or chime rings for steel drums.

In the manufacture of'rolling hoops or chime rings for steel drums ditficulty is experienced in forming the rings of true circular form throughout by the usual forming rolls, especially when the hoops or chime rings are made of heavy bars or beams. l/Vhen heavy beams of this character are passed between the usual forming rolls, the leading end of the blank as well as the end last to leave-the rolls remains substantially straight because the rolls must be'spaced apart a' considerable distance to accommodate the thick blank therebetween and the necessary wide spacing of the relatively heavy rolls required. 1 The substantially straight end portions must be carefully formed to proper contour after'the major portion of the blank has been curved to circular' form and this entails added labor and expense. Another serious defect in this procedure is that the portion of the blank curved by the forming rolls is subject to distortion during the final operation of bending the straight end sections to circular'form.

The main object of my invention is toovercome the difliculties pointed out by providing amethod of forming rolling hoops or chime rings by so manipulating the blanks that the hoops will be of true circular contour when they leave the forming rolls.

Another object of the invention is to provide a method of forming rolling hoops or chime rings by first forming a bar having curved ends conforming to the circular contour of the finished hoop or chime, then curving the inner portion of the bar to true circular contour. e

A further object of the invention is to provide a method of forming rolling hoops'or chime rings by forming a bar or beam having curved end portions, leaving the intermediate portion straight and passing the bar between curving rolls to form the same to true c1rcular contour throughout; 7

Yet another object of the invention is to provide a method of forming rolling hoops or chimerings from a continuous bar, including the following steps: Curving the bar at spaced intervals while leaving the remainder of the bar substantially straight; severingv the bar at a point between the ends of the length ofeach curved section to provide a plurality of blanks having curved end sec tions and intermediate straight sections and curving the. intermediate straight sections of each blank to circular formto provide a ring oftrue circular contourithroughout.

. A still further object of the invention is to provide amethod of forming ring-like mem-' bers by providing bar-like-blanks having" curved end I portions and intermediate straight portions, passing the blanks so formed through curving rolls, thereby shaping the blanks tootrue circular ring-like form",

and bringing the extremities of the blank into abutting relation and permanently joining said abutting extremities.

Other objects of theinvention will more clearly appear from the description and claims hereinafter following.

In the drawings, forming apart of this specification, Figure 1' :is a perspective view illustratinga blank-in the form of an I-beam bar employed in connection with my improved method. Figure 2 is a diagrammatic plan view illustrating the first step of my method, showing the forming dies cooperating with the end of the blank. Figure 3' is a diagrammatic view illustrating the cutting operation, showing the position of the cutting dies after the blank has been severed. Figure 4 is a diagrammatic view illustrating the fourth step of my improved method, showing the bending dies forming a curved section in the blank. Figure 5 is a diagrammatic'view illustratingthree bending rollers V between which the blank is passed to curve the same. Figure 6 is a view similar to Fig ure 5 illustrating the bending rollers and showing the blank at the stage when the curving operation has been carriedon to com- I pleteabout one-quarter of the circle of the ring. AndFigure'? illustrates the finishedrolling hoop or chime ring.

In said drawings, referring particularly to Figure 1, l0 designates a continuous length of I-beam section employed in connection with my improved method.

The first operation of my improved method comprises bending the end portion ofthe blank to a curvature corresponding to the curvature of the finished rolling hoop or chime ring to be formed. The end of the blank 10 isinserted between forming dies 11 and 12 shown in'Figure 2, the forming dies being recipro cated, thereby bending the end section of the blank to the curvature of the finished ring,; as.

indicated at 13. After this bending opera-- tion, the blank is served between the ends of the curved section 13, as most clearly shown in Figure 8. The cutting dies are designated by 14; and 15, respectively, in higure 3, these dies being relatively moved to sever or shearthe blank, the bending dies 11 and 12 being preferably provided withguide-ways 16 and 17 to accommodate the cutting blade 15. In the machine employed to carry out the described steps of this method, the parts areso timed that the forming die 11 will be moved away from the bar 10 so as to clear the cut curved section thereof, so that the blank will be of the proper length when completed to form the continuous ring of predetermined size.

After the blank has been severed, as indicated in Figure 2, the length of the bar is advanced through the bending machine until it'assumes the position shown in Figure 4:,

whereupon the bending operation described in connection with Figure 2 is repeated, thus forminga curved section 19 in the blank, as indicated in Figure 4. After the blank has been curved, as described, the cutting operation is again performed, shearing the blank on the line designated by 20 in Figure 4. As will be evident, this operation provides a length of blank of I-beam form indicated by 21. having the opposite ends thereof curved to the true circular contour corresponding to the finished chime ring .or rolling hoop, the

portion intermediate the curved sections being left substantially straight, as indicated at 22.

The blank 10 is next advanced between the bending dies to an extent to provide a second blank corresponding to the blank 21, the bending and cutting operations just described being repeated. until the length of the I-beam bar 10 has been used up.

These operations are repeated will act to curve the straight section of the,

blank .to the true curvature of the finished ring, as most clearly shown in Figure 6. This operation continues until the other extremity of the blank is reached, the latter passing through the forming rolls Without any bending effect thereon.

' When the curving operation performed by the rolls 23 has been rompleted, the extremitiesiof the blank will be positioned, as shown in Figure 7 that is, in true abutting relation.

The extremities are then permanently joined in any well knownmanner, being preferably welded,.thus providing a complete continuous chime ring or rolling hoop.

It will be evident that due to the extremities of the blanks being curved, no further bending operation is necessary after the blank has been passed between the curving rolls 23.

In the method heretofore commonly employed wherein a straight blank is passed through three forming rolls to form chime.

rings, ap iireciable lengths of the ends of the blank will beleft substantially straight. This results from the fact that the rolls must be spaced apart a relatively large distance,

due to the fact that the rolls, in order to prevent springing thereof, require shafts of substantial sides which in turn limits the spacing of thecenters of the shafts. Obviously, the heavier the bar or blank being op erated on, the greater must be the distance between the centers ofthe rolls and, consequently, the longer the portions which are left straight at the cndsoi the blank. In the former method the lead roll, such as inclicated at 23 in the dra ing, simply acts as a guide roller to carry the blank between the pair of opposed rolls which form the actual curving or bending operation. As will be evident, the length of blank between this pair of rollers and the feeding rolls 23 will be left substantiall straight, the curving or bending of the blank beginning only after the extremity of the blank has reached the point between the pair of curving rolls. The remainder of the blank will then be curved or bent into circular form until the end of the blank which, leaves the rolls last will be left straight. In such. former method, it is evident that a blank thus curved must thereafter have the ends thereof formed to true circular contour after the main bending or curving operation. Heretofore this has been accomplished in a separate bending machine entailing additional labor. It will be evident that such operation on the end of the blank after themain bending operation, is accomplished with great danger of deforming the ring portion of the curvedmember, and in case the ring is thus deformed; additional shaping operations are required to bring the blank to true circular contour. Anoth-er'disadvantage of the usual former method resides in th fact that the end'faces of the blanks are deformed. and upset by the final shaping operation, thus preventing true fiat con act \veen these end faces when the we ding f the ends is attempted. With my impro e 1 method it will be evident that the end faces of the blank are initially cut on radii of the completed ring and are not disturbed or deformed in any subsequent operation on the blank.

A distinct advantage of my improved method is that in addition to the ends of the blanks being formed to true circular curva-' ture, the severing of the blanks into proper 7 lengths being performed subsequent to the first bending operation assures true flat end faces on th opposite ends of the blank so that 1 good welded joint maybe easily made.

lVhile I have herein shown and described What I nowcensider the preferred manner of carrying. out my invention, the same is merelv illustrative and Icontemplate all changes Find modifications that come within the scope of the claims appended hereto.

I claim:

1. A method of forming ring-like members from straight lengths of bars including the following steps: bending a length of the bar at spaced intervals to a curvature corresponding to the curvature of a completed ring member; severing each curved section transversely of the length of said curve to provide blanks having curved ends and intermediate straight portions; and bending said intermediate portions to a curvature corresponding to the curvature of a c ompleted ring, thereby bringing the BX'DIelllltlBS of the curved ends into abutment relation.

2. A method of forming ring-like members from straight lengths of bars mcluding the following steps; bending the length of barat two spaced zones while leaving the remainder of the bar substantially straight to provide bent sections of a curvature corre spending to the curvature of a finished ring;

severing the bar transversely through the curved sections to provide a blank having the opposite ends thereof curved; then bending the straight intermediate portion of said of rings of true circular contour.

from continuous straight bars-including the r curving the intermediatestraight portion of said blank to form a continuous ring-like member. I r

LA method of forming rolling hoops from continuous straight bar sections in cluding the following steps: curving one end section of the bar; cutting oif a portion of said curved end section'transversely; curving a section of said bar at a predetermined distance from said curved end; severing the said bar through the curved section last formed to provide a blank having the opposite ends thereof curved; repeating said last named curving and severing operations to provide a plurality of blanks having the ends thereof curved; and curving the straight intermediate portions of said blanks to form rings of true circular contour. V

'5; A method of forming ring-like members from bar material including the following steps :forming in a bar a plurality of sections having curved portions bent to the curvature of completed ring members of predetermined size; severing said sections from said bar intermediate the curved portions formed therein and-then curving the straight intermediate portions of said blanks to provide a plurality 6. A method of forming ring-like members from straight lengths of bars" including the following steps: curving the blank at spaced zones while leaving the remainder of the blank substantially straight; severing the blank through said curved zones to provide short lengths having curved ends and intermediate straight portions; and bending the intermediate portions of said shortlengths to a curvature corresponding to the curvature of said ends to provide rings of true circular form throughout.

7. A method of forming ring-like members from straight lengths of barsincluding the following steps: bending a length of the bar at spaced intervals'to a curvature corresponding to the curvature of a completed ring member; severing each curved section midway of the length thereof to provide lengths having curved ends and intermediate straight portions; and curving said intermediate portions to correspond to the curvature of said ends, thereby bringing the extremities of the curved ends into true abutting relation and completing the rings.

8. A method of forming ring-like members from lengths of bar material including forming a length of bar-like blank having the opposite ends thereof bent to the curvature of a completed ring member; passing said blanks between curving rollers to form the remainder of said blank to true ring-like form, said rollers due to their disposition and the curvatures of said ends being confined in their curving operation to the remainder of the blank between said curved ends thereby bringing the extremities of said blank into abutting relation and providing a ring of true circular contour throughout.

9. A method of forming ring-like members from straight lengths of bar including the following steps: bending the length of bar at two spaced zones While leaving the remainder of the bar substantially straight to providebent end section of a curvature corresponding to the curvature of a finished ring; severing the bar through the curved zones thereof to provide a blank having the opposite ends thereof curved; then curving the straight intermediate portion of said blank to correspondto the curvature of said ends, thereby bringing the ends into abutment; and then permanently joining the end sections.

10. A method of forming ring-like members from bar materialincluding forming the ends of a length of bar-like blank to the curvature of a completed ring member by bending confined to said ends, then curving the remainder of said blank to true ring-like form by bending confined to said remainder of the blank, thereby providing the finished ring-like member of uniform curvature throughout.

In Witness that I claim the foregoing. I have hereunto subscribed my name this 26th day of August, 1927,

WILLIS J. BOYLE, JR. 

